Problems with Demo/sockets/mcast.py

[Charles Follett]

> From: "Jerome Chan" <jchan at maxvu.com>
> Subject: Problems with Demo/sockets/mcast.py
> 
> File "./mcast.py", line 89, in openmcastsock
>     s.setsockopt(IPPROTO_IP, IP_ADD_MEMBERSHIP, mreq)
> socket.error: (22, 'Invalid argument')

Yeah, I ran into this, too. After the graddr is calculated, but before
the mreq is packed, you want to do:

grpaddr = htonl(grpaddr)

Then it will work fine. At least on linux, never tried on win.

charley